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The flow helicity in quasi-orderedcellular convection

Published online by Cambridge University Press:  18 July 2013

A. V. Getling
A. V. Getling*
Affiliation:
Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia, email: [email protected]
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Abstract

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The helicity of cellular convective flows in a horizontal layer of compressible fluid (gas) heated from below and rotating about a vertical axis is studied using finite-difference numerical simulations. The medium is assumed to be polytropically stratified. An initial thermal perturbation is introduced so as to produce a system of Bénard-type hexagonal convection cells. The flow gradually becomes less ordered, and the mean helicity grows initially and decreases sharply after the substantial chaotisation of the flow. Given the Rayleigh and Prandtl numbers, the maximum value reached by the mean helicity increases with the decrease of the polytrope index and has a maximum at a certain rotational velocity of the layer.

Keywords

convection
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 359 - 360
Copyright
Copyright © International Astronomical Union 2013 

References

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Getling, A. V. 2012, AZh, 89, 441 (Astron. Rep., 56 395 2012)Google Scholar